More than 150 acts will play throughout the two April weekends. In addition to OutKast's Friday shows, Muse is slated to headline Saturdays and Arcade Fire will close out Sundays. Other highlighted performers include The Replacements, Beck, Calvin Harris, Broken Bells, HAIM, Neko Case, MGMT, Girl Talk, Foster the People, Ellie Goulding, Neutral Milk Hotel, Lana Del Rey, Pharrell Williams, Chromeo and Queens of the Stone Age.